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X‐Ray Microanalysis on the Surface and Cross‐Section of burning‐interrupted aluminum particle and foil in high pressure atmospheres
Author(s) -
Tokui H.,
Iwama A.
Publication year - 1989
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.19890140402
Subject(s) - foil method , particle (ecology) , microanalysis , ignition system , deflagration , materials science , surface (topology) , oxidizing agent , spheres , aluminium , analytical chemistry (journal) , chemistry , metallurgy , composite material , explosive material , physics , detonation , thermodynamics , geology , geometry , oceanography , organic chemistry , mathematics , chromatography , astronomy
In order to deduce the burning characteristics of aluminum (Al) particle in solid propellant, a model experiment has been carried out with Al spheres of 3 mm ∼4 mm dia. in the oxidizing atmospheres at elevated pressures. As one of the investigation items, X‐ray microanalysis for the burning‐interrupted Al spheres was conducted along the straight lines crossing cap‐like Al 2 O 3 islands attached on unburned Al. It was clarified that, on the way of burning, in the case of Al sphere and plausibly on the burning surface of the particle also, there exist numerous Al 2 O 3 islands, large and small, floating on molten Al sea; but even on the sea part, which seemed pure Al only, the surface is covered mostly with Al 2 O 3 film. The similar analysis was applied to the Al foils ignited with Joule heating. It was witnessed, however, that contrary to the sphere surface there remains still neat Al in the vicinity of burning‐interrupted surface. This fact may introduce low ignition temperature (933 K ∼ 963 K) and high deflagration velocity along the surface (for example. 2500 mm/s, with test piece of 0.11 mm thick, 5 mm wide; 8 MPaO 2 ) with Al foils.